Ultra Muscle
Before the series evolved into a hyper-crazy wrestling manga, Kinnikuman initially was a rather on-the-nose Ultraman parody - from the fin-like structure on his head, to fighting kaiju and having a "Kinniku Beam" technique to emulate Ultraman's Spectrum Beam, and he even once claimed to be one of the Ultra Brothers.

The sequel series Kinnikuman Nisei would continue this tradition by naming Kinnikuman's son after Ultraman Taro - even highlighting the reason within the story.